Improvement in pavements



E. MCDONALD.

'PAVEMENTS.

yPatenLed Ma rc1114,1876.

NA PETERS. PHO

TENT QFrIcn nRAsTUs MCDONLD, or BELOIT, WISCONSIN.

|MPRovi-:MENT IN PAvEMEN'rs.

Specification forming part of Letters Patent No. 174,737, dated March 14, 1876; application filed February 1, 1876.

full, clear, and exact description thereof, which' will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings,

and to the letters of reference marked thereon, which form a part of this specilication.

Similar letters of reference indicate corresponding parts.

In the drawings, Figure l is a perspective view, and represents a detached section of my newly-inventedpavement, composed of wood and iron, or other metal, complete. Fig. 2 is a topview of a subdivision ofthe section shown at Fig. 1. Fig. 3 is a View o f one of the metal bolts vshown at Figs. 2, and 4., and Fig. 4 is a view of a vertical section of the part shown at Fig. 2, taken through the center of a row of bolts shown at Fig. 3, and also vertically atFigs. 1 and 2.

ln the said drawings, A A A A represent a complete section of my improved pavement, provided with metal plugs or bolts c. Al is a detached subdivision of the section A A A A, A2 represcntin g a vertical section of the lastmentioned part, and c represents metal plugs or bolts which are let into the face of vthe pavingsections in the manner shown at Fig. 4.

My invention consists in constructing a wooden pavement formed of sections, or a series of sections, of closely-fitting blocks of suitable timber, and of such vertical length, size, and form as may be found best adapted for forming a strong continuous street pavement of even surface, made equivalent to a compact solid mass by cementing together the vertical sides of each subdivision, section, or blocks,lwhich is accomplished by the .em-

- ployment of a cement compounded of plasterof-paris and common glue, combined in suitable proportions, by means' of which the whole structure is made equivalent to a solid mass and rendered entirely impervious to water.

This pavement is intended to be. laid upon a suitably-prepared surface of earth, gravel, broken stone, or concrete, Without a prepared floor of boards or the like. But the chief and most important feature of my invention consists in the employment of metal bolts or plugs c, as shown, which renders the face of the pavement practicably indestructible from ordinary wear, and at the same time presents a surface sufficiently rough to prevent the wheels of vehicles from sliding thereon, andv also giving enough roughness of roadway- `surface to electually prevent horses or other draft animals, or even pedestrians, from slipping thereon when the street may be sloppy, and even give a safe footing to shod horses, should the pavement be covered with frozen sleet.

The upper ends or faces of the paving sec- -tions or blocks are perforated with augerholes in rows or lines across the entire street, say, about three-quarters of oneinch in diameter, two inches deep, and near enough to gether sol that when filled withmetal plugs or bolts, having their heads projecting about one-eighth o r one-,quarter of one inch above the surface of the wooden blocks, the tire of any vehicle cannot in any way touch the surface of the wooden blocks.

These bolts or plugs are in general to be of iron cast on chills, but may be of steel or other suitable metal. They are to iit tightly in the4 auger-holes in question, and when arranged as hereinbefore described will present a surface which in respect to the wheels of vehicles upon it will be practically level, and cause little or no-jolting; and the chilled surfaces'of the metal thus presented must be almost everlasting, and maybe usednpon several relays of wooden blocks.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A pavement, formed of blocks of Wood AA A, perforated to receive the metallic plugs ce, which form the wearing-surface, and cemented together by a cement composed of plaster-ofparis and glue, as described, substantially as specified. i

In testimony thatl claim the foregoing as my own invention I affix my signature in the presence of two witnesses.

ERASTUS MCDONALD. Witnesses:

'0. A. TATTERsHALL, OnARLEs NEWBURGH. 

